Brush



FIG. 1 is a perspective view of the brush;

FIG. 2 is a front view of the brush;

FIG. 3 is a side view of the brush;

FIG. 4 is a top view of the brush; and,

FIG. 5 is a bottom view of the brush.

The broken lines depict a brush head that forms no part of the claimed design. 

CLAIM The ornamental design for a brush, as shown, and described. 